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oooooooo I C- JFELTONI y o S-1' o CWM@ l lilullw "emr-ED ervaring CLEMENT FELTON, OF TORONTO, CANADA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 443,910, dated December 30, 1890.

Application iiled September 6, 1890, Serial No. 364,146. (No model.)

To all whom rit 72mg/ concern.'

Beit known that LOLEMENT FnLroN, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Door-Locks, of which the following is a specification.

The object of the invention is to design a strongly-constructed, simple, and unpickable lock; and it consists in the peculiar construction, arrangement, and combin ations of parts, hereinafter more particularly described, and then definitely' claimed.

In the accompanying drawings, Figure l is an elevation of my lock with the back plate removed. Fig. 2 is a similar View with the parts in a different position. Fig. 3 is a similar View of part of theloek with the tumblers removed. Fig. 4 is a section through the line :r in Fig. l. Fig. 5 is a section of an independent tumbler, showing also the acting part of the key. Fig. (i is an edge view of the acting part of the key.

Referring now to the details of the drawings by letter, A represents the case, preferably struck up of sheet metal and provided with studs B O, the former havin g a hole which maybe screw-threaded to receive a screw (not shown) for securing the plate t to inclose the works.

D is the bolt, which is preferably of T forni in cross-section, whereby it is made very light yet strong. This bolt is slotted at d near one end to allow itto work over the stud C, and at its other end it is provided with a stud d. One end of this bolt works in a T-shaped slot in the casing and its other or inner end fits in a dovetail recess in a guide E, fixed in the casing A, said inner end being shaped to correspond to the dovetail recess in the guide E.

F F F indicate a series of tumblers pivoted on the stud C and having slotsfin their free ends of varying shapes, but all of them showing a curved portion at right angles to the motion of the bolt and a straight portion substantially in line with the saine. Each tumbler has a spring f preferably formed in one piece therewith, which bears against the stud B and tends to keep the tumblers down.

At G is shown a rotary barrel whose ends are shouldered to fit in the back and front plates of the casing. and is provided with a bit g to act on the boltD and a slit to receive the thin portion of the key,which is widened at each end to receive the thicker portion of the key which turns the barrel.

The key I-I is made of two parts, a shank h and a bit h', the latter being made of thin sheet metal, preferably steel, secured in a slot in the former. The bit is notched in such a manner that when the key has been inserted in the barrel and then turned it raises all the turnblers F to such a position as to bring the horizontal portions of the slotsf into line, so that the stud d can pass into said horizontal portion of the slots.

The operation is as follows: Supposing the parts to be in the position shown in Fig. 1 and it is desired to lock the door to which the lock is attached, the key is inserted in the lock as far as it will go, or until the end of the shank cornes in contact with the bottom of the wide portion ofthe slot in the barrel G, when by turning the key the bit g passes into the notch in the bottom of the bolt and moves it outward, as shown in Fig. 3, and by continuing to turn the key the bolt passes out to the full extent of its motion, as shown in Fig. 2,when the tulnblers drop down, as shown in said Fig. 2, and the key is still turned until the barrel assumes the position shown in Fig. I, in which position it cannot be picked, as the openi-ng is too small to allow of the insertion of lock-picking tools. To unlock itthe key is inserted7 as before, and turned in the opposite direction, when the bit 7L raises the turnblers, as shown in Fig. l, in which position the horizontal slots in all the tumblers are in a line with the stud d', as shown in Fig. ft, and the bit g moves the bolt backward, and thus unlocks the lock. From this description it will be seen that I have invented a lock which is practically nnpickable, and yet one that may be cheaply made and not likely to get out of order, for 4although the bit of the key is very thin yet it is strengthened by the bit of the barrel, and as all strain of moving the bolt comes on the bit of the barrel and the shank of the key the bit of the key is not likely to be damaged by wear.

That I claim as new is- 1. The combination, in a lock and with the bolt and tuniblers thereof, of a barrel hav- IOO ing a bit y, zi slit to receivo the bil' of the key, tho tumbiers zuid a Thick portion to tilrn tho narrmved it one portion to b said bit of the bmrol, substantiaily as described. key and widened at :mother portion to re- Toronto, August 2, 1890.

i i Celve the shank of the same, Substanimiiy :is i CT FMFNT FFIYTO 5 described. g

. The co1nbiuatio1i,\vith the boltand tum In presence 0E-n blers of look provided with a rotary barrel, CHARLES C. BALDWlN,

of a key having a thin portion to operate on F. A. VOODWARD. 

